Pocket-Calculator Approximation for Areas under the Standard Normal Curve

for Rules (1) and (2), respectively. Figure 2 clearly demonstrates that the value of p strongly influences the size of the absolute error for both rules. Indeed, nj(p)p(1 p) is roughly equal to 9 for all p, but MABS(nj(p), p) decreases from .0211611 to .0007444 as p increases from .01 to .5. n2(p)p is roughly equal to 5 for all p, but MABS(n2(p), p) decreases from .0284163 to .0025054 as p increases from .01 to .5. Our computations show that the bound